In the 40-degree heat, some 25 bodies lie on the floor breathing deeply. We’ve just finished a Bikram yoga class. Our towels are damp beneath us. After 90 minutes of feeling faint and queasy I’m desperate to leave. But across the room from me lies Goldie, the 45-year-old drum ‘n’ bass artist turned TV star, and I’m waiting for him to stir. On the way into the class he gave me, the novice, some advice: “If you’re struggling, just concentrate on your breathing. There’s a riot going on in my head but nobody else knows it.” Only now do I know what he means. Every few minutes I’ve had to silence the screaming voice telling me that if I can’t stand the heat I should get out of the Bikram studio. Goldie gets up and I follow his move. We’re both slicked wet with perspiration. He walks over, opens his arms wide and hugs me. Sweat on sweat. Emotional though this moment may be, Goldie hasn’t been through the same struggle I have this morning. After 11 months of practising Bikram yoga three or four times a week he has breezed through the class. He’s lost 22lbs since he started and tells me: “I now look the same as I was when I was 30, but internally I’m harder and much stronger than I was then.” When we get outside he’s almost jumping with energy (I’m near collapse), and excited about the day ahead. “I won’t stop babbling now. I’m off. That’s it. Wooo hoo,” he chirrups. “I’ve had a week feeling shitty [from a cold], but now I feel great.” Goldie lives with his wife Mika (who is four months pregnant) and 11-year-old daughter Chance (from a previous relationship) in Hertfordshire but several times a week he drives into London to visit the Sohot Bikram Yoga studio in Soho to get his fix. And a fix is partly what it is like to Goldie. “Yoga is like a drug. You start feeling something across your skin and your hair stands up. You start feeling high,” he says. “If I had administered that stuff up my nose an hour earlier you’d think I had paid good money for that. It’s working.” He should know, being no stranger to drugs. “I was addicted for years. But this starts to replace it. I’m getting high but it’s not bad for me and I don’t have dodgy dealers knocking on my door.” Goldie has been clean of drugs for three years now but after taking up Bikram on the recommendation of a friend who “is always super-chilled – very Zen” the yoga is turning him off toxins altogether. “It totally changes what you want to put in your body,” he says. “On a night out I used to have a litre and a half of vodka, two Rohypnol Now I have a...